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Instead of singing "One, two, chew on a shoe, three, four, bark at the door", the family claim the last part sounds like ""f*** at the door".

Online reviews of the toy, which is widely available, show other worried families have also picked up on the apparent expletive.

Stuart, a 56-year-old retired IT worker, said: "When Jessica heard it she phoned us up and asked, 'Is this some kind of joke?' And then when she played it to us we both heard it and I just thought, 'oh my God! '.

"These things are supposed to teach children to speak properly, so you'd think they would over-enunciate correctly."

The grandparents claim that the product, costing £17, sings "f*** at the door" (Image: SWNS.com)